<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>多栏布局</title>
    <link rel="stylesheet" href="css/DivTest04.css">
</head>
<body>
    <div id="back">
        <div id="top">top</div>
        <div id="center">
            <div id="left">left</div>
            <div id="right">
                <iframe src="cat.html" frameborder="0" id="showCat"></iframe>
            </div>
        </div>
        <div id="foot">foot</div>
    </div>
</body>
</html>